Gear-wheel pump



Oct. 12 1.926. 7 1,602,740

A. BECHLER GEAR WHEEL PUIP Filed Nov. 13, 1925 2 Sheets-Sheet 1 f7. Bach/er mven tor Oct. 12 1926. 1,602,740 A. BECHLER I GEAR WHEEL PUMP Fi led Nov. 13, 1925 2 Sheets-Sheet z w H0 4o 1 150 v //In Patented Oct. 12, 1926.

UNITED STATES ANDRE BEGHLER, OF MOUTIER, SWITZERLAND.

GEAR-WHEEL PUMP.

Application filed November 13, 1925, Serial No.

The present invention'relates to a gear wheel pump adapted for producing by a simple arrangement a considerable pressure and provided with means for changing the output. For this purpose the distance be tween the centers of the gearing wheels is adjustable or made variable.

In certain manufacturing as for instance in the manufacture of artificial silk pumps are required developing a considerable pressure and delivering always the same quantity quite independently from the tightness of parts or of the number of draw plates to be fed. In order to fulfill such conditions pumps having a plurality of pistons of a variable stroke have been proposed. But such pumps in order to secure the constancy of the pressure must have a large number of pistons which necessitates a certain succession of the working strokes so as to secure a continuous running. Such pumps are therefore easily injured and expensive and never give a good continuity of output.

It is the object of the present invention to propose a pump free of all such defects.

In the accompanying drawing two working examples of a pump according to the invention are shown.

Fig. 1 is a side elevation with cover re moved of a first working form, and

Fig. 2 a Vertical section on line IIII in Fig. 1,

Fig. 3 is a plan of the second form,

Fig. 4. a section on line IV-IV of Fig. 5 and Fig. 5 a section on line VV of Fig. 3.

The pump represented in Figures 1 and 2 possesses an open box 1 closed by a cover 2. The box is supporting a trunnion which is integral with a rotative bracket 3 and carries on the outside of the box an arm 4. Bracket 3 embedded in a cavity on the inside of box 1 supports one pinion 5 of the two pinions of the pump. The axis of rotation of this pinion 5 does not correspond with the axis of the rotative bracket 3 but is arranged eccentrically so that, when the latter is turned,'said pinion is withdrawn from or approached to the center of the second pinion 6 likewise embedded within a cavity of box 1. The axis of this second pinion crosses the cover 2 and carries the outside pinion 7 by means of which the pump is operated. As seen from Fig. 1 the rotative bracket 3 partly surrounds the inion 5 tightly so that the latter moves as if it was 68,913, and in Switzerland November 18, 1 924.

embedded within a cavity of the box like pinion 6.

, This pump works like the usual gear wheel pumps. The gear wheels turn in the direction of the arrows in Fig. 1 and the liquid is introduced through a canal 8 and delivered through a canal 9 after having passed between the teeth of the pinions. If by means of a rocker arm 4 moving in the face of a division the bracket 3 is swung so as to change the distance between the centers of the two pinions the teeth of the two gear wheels allow a certain quantity of the liquid to refiow again to the suction side whereby the output of the pump is diminished. In this way the output of the pump maybe changed according to the eccentricity between the axis of the pinion 5 and the axis of the bracket 3.

It is clear that instead of one arm 4 any other device could be mounted on. the axis of bracket 3 for instance the wheel of a worm gear so that the change of eccentricity could be as small as possible.

In the second working form according to the Figures 3, 4 and 5 there isa casing 10 open on both sides and enclosed between a cover 20 and a block 30. To the latter are attached two tie rods 40 which are holding a cross bar 50. A pressure screw passing through the center portion of said cross bar and bearing on the cover 20 presses the casing 10 against the block 30 with a tight fit. A pinion turns freely within a cavity 7 0 of said casing and is guided at its periphery by said cavity. This pinion 80 gears with a pinion which turns round a stationary trunnion and which is integral with a shaft lodged within the block 30 and is extended to the outside where it carries a rope pulley for driving the pump. The pinion 90 turns within a cavity of an adjustable segment having the same thickness as the casing 10 and the pinions 80 and 90. A pin maintains this segment and with it pinion 90 in a iven position and guides the casing 10 while this casing is swung by means of the screws which pass across swellings of the rods 40. These screws bear on lugs east to the casing 10. The liquid is introduced by means of a canal within block 3 and is delivered through a canal 180.

In order to regulate the output of the pump the casing 10 is swung around the center of block 30 by means of the screws 140 and is guided during this movement on the. periphery of the segment 12.0. By these wringing movements pinion 80 will be removed from or approached to the pinion 90 and according to the distance between the axes of these pinions a greater or lesser quantity of liquid caught in the spaces between the teeth which are turning in the direction indicated by' the arrows in Fig. will rel'low again into the suction chamber of the pump.

By unscrewing the pressure screw the cover and the casing may both be removed without any tool. After the casing 10 has been removed the pinion may be taken out by an axial pressure by hand and the segment 120 may be removed from the block 30 so as to uncover the teeth of the pinion which is integral with the trunnion 10. Then this latter pinion can be withdrawn after having removed the rope pulley 110.

It must be stated that by regulating the output of the pump also the conditions of tightness-i ot the stationary pinion 90 are changed because by means of the screws 1 1-0 the removable segment is swung around the pin which means that the walls of the cavity are pressed against the teeth of said pinion 90. Regarding the other pinion St) the el'iect ot' gearing will be to press said pinion into the cavity ot the casing.

\Vhat I claim is:

1. In a gear wheel pump for furnishing viscose threads of a predetermined thickness and in combination a casing having a circula lodging, a bracket fitted slidably into said lodging, a set of pinions the first of them guided within an eccentric cavity of said casing and the second eccentrically lodged within and partly surrounded by said bracket and means adapted to turn said bracket within its lodging and to regulate thereby the distance between the two pinions and the output of the pump.

2. in a gear wheel pump of the kind described and in combination a casing having a circular lodging, a bracket fitted slidably into said lodging, a set of plnions, the first of them guided within an eccentric cavity oi said casingand the second eccentrically lod-ged witliin and partly surrounded by said bracket, a block confining the hollow of said casing and forming the support of said sec- 0nd pinion and adjusting screws mounted on id block and bearing on arms fast to said casil'ig as means for turning said bracket within its lodging in order to regulate the distance between the two pinions and thereby the output of the pump.

3. In a gear wheel pump and in combination, a box open on one side, a cover fitting tightly said open side of the box, a set ot pinions tightly enclosed between box and cover, a trunnion integral. with the first of said pinions and lodged in the cover, a driving wheel fast to said trunnion on the outside of said cover, and a rotative bracket having a cavity surrounding tightly the second pinion and having its axis of rotation arranged eccentrically to the axis of r0tationcf the second pinion.

i. In a gear wheel pump and in con1bination a box and a cover having a pin ongaged to said box, a casing open on both sides and titted tightly between box and cover, a segment in a cavity of said casing and serving as guide to it and pivoted on said pin o'lfthe cover a set of pinions the first embedded eccentrically in a cavity 0i. said casing and the second embedded .in a cavity of said segment, two tie rods secured to said box, a cross-bar carrying a pressure screw for said cover attached to said tie rods, lugs cast to said casing and adjusting screws heid in swellings of said tie rods and hearing on said lugs of the casing so as to be adapted to regulate the output of the pump by changing the distance between the centers of said pinions.

In testimony whereof I aflix my signature.

' ANDRE BEGHLER. 

